• Title, Summary, Keyword: SSH

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Analysis and Response of SSH Brute Force Attacks in Multi-User Computing Environment (다중 사용자 컴퓨팅 환경에서 SSH 무작위 공격 분석 및 대응)

  • Lee, Jae-Kook;Kim, Sung-Jun;Woo, Joon;Park, Chan Yeol
    • KIPS Transactions on Computer and Communication Systems
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    • v.4 no.6
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    • pp.205-212
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    • 2015
  • SSH provides a secure, encrypted communication channel between two end point systems using public key encryption. But SSH brute force attack is one of the most significant attacks. This kind of attack aims to login to the SSH server by continually guessing a large number of user account and password combinations. In this paper, we analyze logs of SSH brute force attacks in 2014 and propose a failed-log based detection mechanism in high performance computing service environment.

Alcohol Dehydrogenase Activity and Sensory Evaluation of Hutgae (Hovenia dulcis Thunb) Fruit Soy Sauce (헛개열매 간장의 알코올 분해 활성 및 관능적 품질 특성)

  • Jung, Su-Young;Lim, Jung-Sup;Song, Hee-Sun
    • The Korean Journal of Food And Nutrition
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    • v.25 no.4
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    • pp.747-754
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    • 2012
  • The objective of this study was to investigate free amino acid composition, antioxidant activity, alcohol dehydrogenase activity and the sensory quality attributes for the development of functional soy sauce using Hutgae (Hovenia dulcis Thunb) fruit, which is well-known for improving liver function and alleviating various negative physiological effects following heavy consumption of alcoholic beverages. Soy sauces adding six types of extract from Hutgae fruit (HF) were prepared (SSH1: HF 20%, SSH2: HF 10%, SSH3: HF 20%/40 days NaCl extract, SSH4: HF 20%/20 days NaCl extract, SSH5: HF 20% water bath extract, SSH6: freeze-drying powder from HF 20% aqueous extract), compared with soy sauce using the conventional method. These soy sauces were used for determining alcohol dehydrogenase activity by NADH absorbance, the antioxidant effect by 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and sensory evaluation by sensory scaling. Total free amino acid contents for most samples were in the range of 327.3 to 375.5 mg%, and then, aspartic acid and glutamic acid content of SSH1 and SSH5 were higher than that of others. DPPH radical scavenging activity was shown to be the highest in SSH4, also SSH1, SSH5 and SSF6 were shown to be higher than the control group. Alcohol dehydrogenase activity was shown to be the highest in SSH5. In sensory evaluation, the highest intensity of roast smell was observed in SSH4 while sweet taste was shown to be the highest in SSH5, and SSH3 and SSH5 revealed higher overall acceptability. From these results, Hutgae fruit soy sauces demonstrated antioxidant activity and alcohol dehydrogenase activity. In conclusion, soy sauces containing the water bath extract of Hutgae fruit may be used as a functional seasoning.

Study about remote-access by using TTSSH to OpenSSH Server (TTSSH를 이용한 OpenSSH 서버로의 원격접속에 관한 연구)

  • 강민정;강민수;박연식
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • pp.490-493
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    • 2002
  • Many servers that is operated in present earth are UNIX base, is trend that server of LINUX base is increasing steadily recently. When users who have account to this server wish to do remote access, instruction that use most easily is‘telnet’, security does not consist entirely about ID and password that this uses at communication substance as well as login. The interest about latest SSH is rising by the alternative, but SSH has various kinds problem in following telnet's fame. Therefore, We studied about problems and the solution that can happen when window users attempted remote access laying stress on OpenSSH.

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SSH Traffic Identification Using EM Clustering (EM 클러스터링을 이용한 SSH 트래픽 식별)

  • Kim, Kyoung-Lyoon;Kim, Myung-Sup;Kim, Hyoung-Joong
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.37B no.12
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    • pp.1160-1167
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    • 2012
  • Identifying traffic is an important issue for many networking applications including quality of service, firewall enforcement, and network security. Once we know the purpose of using the traffic in the firewall, we can allow or deny it and provide quality of service, and effective operation in terms of security. However, a number of applications encrypts traffics in order to enhance security or privacy. As a result, effective traffic monitoring is getting more difficult. In this paper, we analyse SSH encrypted traffic and identify differences among SSH tunneling, SFTP, and normal SSH traffics. By using EM clustering, we identify traffics and validate experiment results.

Isolation of Bacillus velezensis SSH100-10 with Antifungal Activity from Korean Traditional Soysauce and Characterization of Its Antifungal Compounds (전통재래 간장으로부터 항진균 활성 B. velezensis SSH100-10의 분리와 그 항진균 물질의 특성 구명)

  • Chang, Mi;Moon, Song Hee;Chang, Hae Choon
    • Korean Journal of Food Preservation
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    • v.19 no.5
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    • pp.757-766
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    • 2012
  • The SSH100-10 bacterial strain, which exhibits strong antifungal (anti-mold and anti-yeast) activity, was isolated from traditional korean soysauce aged 100 years. The strain was identified as Bacillus velezensis based on Gram-staining, the biochemical properties and 16S rRNA gene sequence determination. B. velezensis SSH100-10 showed strong proteinase activity and NaCl tolerance, but did not produce enterotoxin. Two-antifungal compounds from B. velezensis SSH100-10 were purified using SPE, preparative HPLC, and reverse phase-HPLC. The purified antifungal compounds were identified as $C_{14}$ and $C_{15}$ iturin through MALDI-TOF-MS and amino acid composition analysis. The stability characteristics of the antifungal compounds after temperature, pH, and enzyme treatments suggested that B. velezensis SSH100-10 produced more than two antifungal compounds; pH-stable $C_{14}$ iturin A and $C_{15}$ iturin A, and unidentified pH-unstable compounds. The results suggested that B. velezensis SSH100-10 can be used in soybean fermentation as a starter. Moreover it has potential as a biopreservative in the food and feed industry and as a biocontrol agent in the field of agriculture.

Statistical Characteristics of sea surface height and sea surface temperature in the Western North Pacific

  • Hwang, Byong-Jun;Kim, So-Hyun;Chung, Hyo-Sang
    • Proceedings of the KSRS Conference
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    • pp.140-143
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    • 1999
  • SSH(Sea Surface Height) from TOPEX/Poseidon and SST data are analyzed to estimate characteristics of annual and inter-annual variations in the East Asian seas(110E - l80E, 20N - 50N) from November 1992 to May 1998. In EOF analysis of SSH and SST, 57% and 97% of the variance are represented by the first two modes. The first mode of SSH and SST shows strong annual variations expected for steric changes. The second mode of SSH shows a long-term variation, but that of SST shows 3 - 4month offset from annual variation. In the EOF analysis of the SSH and SST, 61% and 54% of the total variance are represented by the first three modes. The first mode represented a long-term variation, and the third mode reflected the bi-ennial variation. The first three mode were not strongly correlated with ENSO. We further apply Canonical Correlation Analysis(CCA) to find the dominant correlation patterns with ENSO.

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Effects of Soshiho-tang on Hydrogen Peroxide-induced Oxidative Damage in Hepatocytes (과산화수소로 유도된 산화성 간세포 손상에 대한 소시호탕(小柴胡湯)의 효과)

  • Seo, Sang-Hee;Oh, Su-Young;Lee, Ji-Seon;Cho, Won-Kyung;Kim, Tae-Soo;Ma, Jin-Yeul
    • The Journal of Internal Korean Medicine
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    • v.32 no.4
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    • pp.487-496
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    • 2011
  • Objectives : The aim of this study was to investigate the hepatoprotective effect of Soshiho-tang (SSH) in mouse primary liver cells against hydrogen peroxide ($H_2O_2$)-induced oxidative stress. We also elucidated the molecular mechanism of hepatoprotective effect by SSH. Methods : Cell viability, level of ALT, AST and LDH, intracellular ROS level, mRNA expression and activity of antioxidant enzymes were used to evaluate hepatoprotection of SSH against $H_2O_2$. Target gene expressions were analyzed by real-time PCR. Results : Pre-treatment with SSH for 1 hour prevented cytotoxicity against $H_2O_2$. $H_2O_2$-induced ROS level decreased under SSH pre-treatment. mRNA expression of GPx and SOD increased in SSH-treated cells. In addition, HSP72 and HSP40 gene expression were elevated under SSH-treatment. Conclusions : These results indicate that SSH protects mouse primary liver cells from $H_2O_2$-induced oxidative injury. This hepatoprotective activity of SSH is mediated by decreasing intracellular ROS and increasing antioxidant enzyme expression (GPx and SOD) and stress response protein (HSP72 and HSP40).

The Vulnerability Analysis and Modification of SSH Protocol using Casper, FDR (Casper, FDR을 이용한 SSH 프로토콜의 취약성 분석 및 수정)

  • 김일곤;최진영
    • Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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    • pp.288-291
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    • 2002
  • 보안 프로토콜을 이용하여 사용자 상호 간의 정보의 비밀성, 무결성, 부인방지를 보장하는 일은 반드시 필요한 과제가 되었다. 이에 따라 해당 서비스에 대해 적합한 사용자를 인증하고 인가하기 위해 다양한 보안 프로토콜(EKE, S/KEY, Kerberos등)이 사용되고 있으며, 이와 더불어 보안 프로토콜을 정형적으로 명세하고 검증하기 위한 다양한 방법들이 연구되고 있다. 본 논문에서는 Casper와 FDR을 이용하여 SSH 프로토콜의 취약성을 분석하고, 수정하여 SSH 프로토콜의 안전성을 향상시키고자 하였다.

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A study on gifted education through practical report of SSH in Japan (슈퍼 사이언스 하이스쿨의 실천보고서를 통해 본 일본의 영재교육에 관한 연구)

  • Kim, Boo-Yoon;Jeon, Mi-Jeong
    • Journal of Gifted/Talented Education
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    • v.16 no.1
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    • pp.1-19
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    • 2006
  • This research is the one, that is, analyze the results of SSH at the science and mathematics subject for the advanced student in Japan recently, and searched for the result and the problem. We analyze reported results separately in detail according to the item for the practical report that the school of the whole country where SSH had been experimented from 2002 to 2004 in 31 places had issued for this. Also we discuss some suggestions and ideas for the mathematics and science instruction on the science high school in Korea.

Spontaneous Spinal Subarachnoid Hemorrhage with Spontaneous Resolution

  • Kim, Jin-Sung;Lee, Sang-Ho
    • Journal of Korean Neurosurgical Society
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    • v.45 no.4
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    • pp.253-255
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    • 2009
  • Spontaneous spinal subarachnoid hematoma (SSH) is a rare entity to cause spinal cord or nerve root compression and is usually managed as surgical emergencies. We report a case of spontaneous SSH manifesting as severe lumbago, which demonstrated nearly complete clinical resolution with conservative treatment A 58-year-old female patient developed a large SSH, which was not related to blood dyscrasia, anticoagulation, lumbar puncture. or trauma. Patient had severe lumbago but no neurologic deficits. Because of absence of neurologic deficits, she was treated conservatively. Follow-up magnetic resonance (MR) image showed complete resolution. Conservative treatment of SSH may be considered if the patient with spontaneous SSH has no neurologic deficits.